Automatic damper for stovepipes



T. H. RUDDY. AUTOMATIC DAMPER FOR STOVEPIPES.

APPLICATION FILED MAR-3.1921.

Patented Feb. 7, 1922.

7720271 as H.

UNITED STATES PATENT OFFICE.

THOMAS H. BUDDY, or KALAMA, WASHINGTON.

AUTOMATIC DAMPER FOR STOVEPIPES.

Application filed March 3,

[ all who 17bit may concern Be it known that I, THOMAS H. BUDDY, a citizen of the United States, residing at Kalama, in the county of Cowlitz and State of WVashington, have invented certain new and useful Improvements in Automatic i Dampers for Stovepipes, of which the following is a specification, reference being had to the accompanying drawings.

This invention relates to dampers in stove pipes, and particularly .to that class of dampers wherein the damper is operated automatically to reduce the effective passage through the stove pipe when the draftin the pipe is particularly strong and to mcrease the effective opening of the stove pipe when the draft has decreased.

The general object of my invention is to provide a very simple damperlof this character which may be readily installed in a stove pipe without piercing thepipe.

A further object is to provide a damper of this character with means whereby the damper may be held open at the time when. coal is placedwithin the stove and to prevent any possibility of the stove smoking, this attachment also indicating that the damper is functioning properly.

And a further object is to provide a damper of this character which is automatically operated by the draft within the stove pipe without the assistance of levers, weights oriother agencies.

Other objects will appear in the course of the following description.

My invention is illlustrated in the accom- 4 panying drawings, wherein Figure 1 is a vertical section of a stove pipe with my damper therein, the damper being shown in a partly open position;

Figure 2 is a like view to Figure 1 but showing the damper held in a fully open position;

Figure 3 is a section on the line 3-3 of Figure 2 but showing the damper closed;

Figure 4 is a section on the line 4-4 of Figure 5;

Figure 5 is asection on the line 5 Figure 4;

Figure 6 is a plan view of the bracket.

In the drawings, I have illustrated a stove pipe formed in two sections A and B, the section B fitting over the section A. Disposed within this stove pipe is the automatic damper which I have devised. This con sists of the damper plate 10 and a support- Specification of Letters Patent. Patented Feb. '1 1922 1921. Serial No. 449,595. p

ingbracket 11. This supporting bracket outer face thereof, the extremity of the strip being upwardly bent, as at 13. The section B of the pipe fits over the outer portion of this bend 12.

At its inner end the strip 11 is bent to form an open eye 14. The damper plate 10 at a point to one side of the center of the damper and as illustrated at a point approximately one-third of the diameter of the damper is transversely slitted at two points. The portion 15 between these slits is upwardly bent. A pin 16 passes beneath this portion 15 and through the eye 14. This means permits the damper to be freely pivoted upon the extremity of the bracket 11 so that the damper can readily turn from a pending position, but as'the draft increases the pressure on the large portion aJof the damper outward of the pivot-pin 16 becomes sufiicient to lift thedamper to a horizontal position when the damper "extends transversely across the pipe. As the draft decreases, the damper will again open to a degree depending upon the draft within" the pipe and if the draft decreases to an extent permitting it, the damper will again shift to its vertical position. It will be seen that so far as I have described the damper, the pipe sections do not have to be pierced for the carriage of the damper but that the damper may be readily installed within a stove pipe without in any way damaging the pipe.

Preferably in the larger dampers 1 provide an attachment whereby the damper may be held in an open position at the time when coal is placed uponthe fire so as to prevent any possibility of the stove smoking and whereby to steady the action of the damper and indicate to a certain extent its position. This attachment comprises a wire 17 which is approximately arcuate in shape, the extremit of the wire being formed with a stop 18. he other end of the wire passes through an opening 19 in the stove pipe and this portion of the wire is formed with two upwardly extending bends 20 and 21 forming notches'whereby the wire 17 is held in either of its two adjusted positions. The wire passes through the opening 19 and at its outer end is formed with a downwardly bent cranked portion 22, and attached to this cranked portion is a weight 28. The purose of the cranked ortion and weight is to old the wire 17 with its curved part upwardly extended approximately concentric t0 thepivot 16, the damper being'perforated for the passage of this wire. WVith the wire 17 held in this position by the weight 23, it is obvious that the damper will have free movement from its horizontal to its vertical position, but that when it is desired to posi tively open the damper and hold it open under all circumstances, then the wire is to be drawn outward until the notch 20 engages with the wall of the opening 19. Under normal circumstances,- however, the notch 21 of the wire will be engaged with the the stove pipe and the weight 23 will hold this wire, as before remarked, with its inner portion upwardly extended so as to permit the free movement of the damper. This weight causes the wire when it is arranged forward to the last notch to right itself curve upward so that the damper will swing on the wire. This wire or rod 17 also acts as an indicator to show that the damper is operating, as the damper is otherwise invisible. 4

'It Will be seen from the drawing that when the damper is in a depending position the curvature given to the damper will cause the damper to extend downward and laterally at a slightangle to the vertical and away from the supporting bracket so that the damper will be caught by the upward draft and closed. The damper is prevented from cqming to an absolutely vertical position by the stop 11.

Attention is called to the fact that the eye 7 14 is not a complete circle but is a loop open at the bottom so that the soot or rust cannot accumulate within this eye but will be free to drop out. It will be seen that as the draft increases, due to the stove getting hotter, the damper will close and that as the draft decreases, due to the stove getting cooler, the damper will open. This damper is applicable to any stove, furnace or other heating apparatus using a smoke stack or flue.

I claim 1..An automatic damper for stove pipes comprising a bracket formed of a fiat strip of metal, the outer end of the bracket being bent upon itself to embrace the margin of. a stove pipe section, the inner end of the bracket being bent to form an eye, a damper plate having two parallel slits, the portion damper bracket engaged therewith and projecting into the stove pipe, a damper plate pivoted to the inner end of the bracket for free oscillation, the pivotal point of the damper plate being disposed to one side of the center of the plate and the smaller portion of the plate being disposed above the bracket, a wire passing through thestove pipe and through the damper plate, said wire at its inner end being bent upward in a curve approximately concentric to the pivotal center of the damper plate and formed with a stop at its extremity, the opposite portion of the wire from the stop he ing formed with two bends constituting notches and adapted to engage the wall of the perforation through which the wire passes whereby the wire may be adjusted to permit the free movement of the damper plate or hold the damper plate in a vertical position. 7

3. The combination with a stove pipe, of a damper bracket engaged therewith and projecting into the stove pipe, a damper plate pivoted to the inner end of the bracket for free oscillation, the pivotal point of the damper plate being disposed to one side of the center of the plate, the smaller portion of the plate being disposed above the bracket, a .wire passing through the stove pipe and through the damper plate, said wire at its inner end being bent upward in a curve approximately concentric to the pivotal center of the damper plate and formed with a stop at its extremity, the opposite portion of the wire from the stop being formed with two bends constituting notches and adapted to engage the wall of the perforation through which the wire passes whereby the wire may be adjusted to permit the free movement of the damper plate or hold the damper plate in a vertical position, the outer end of the wire exterior to the stove pipe being formed with a cranked portion, and a weight attached to said cranked portion and acting to hold the wire with its inner end extending upward,

4;. An automatic damper for stove pipes comprising a bracket formed of a flat strip of metal, the outer end of the bracket being bent upon itself to embrace the margin of a stove pipe section, the inner end of the bracket being bent to form an eye and beyond the eye having a downwardly extending stop portion, a damper plate having two parallel slits, the portion between the slits being bent upward to receive the eye on the bracket, and a pintle passed beneath said upwardly bent portion and through said eye to pivot the damper on the bracket, the pivotal point of the damper being to one side of the center of the damper, the smaller portion of the damper plate being disposed above the bracket.

5. An automatic damper for stove pipes comprising a bracket adapted to engage a stove pipe section, a damper plate pivoted to the extremity of the bracket, the pivotal point of the damper plate being disposed to one side of the center of the plate whereby to cause the damper plate to close under the action of draft and open when the draft is reduced, and means on the bracket preventing the damper plate from lowering to a vertical position but supporting the damper plate when lowered at a slight angle to the axis of the pipe section.

6. An automatic dam er for stove pipes comprising a bracket a apted to engage a stove pipe section, a damper plate pivoted to the extremity of the bracket, the pivotal point of the damper plate being disposed to one side of the center of the plate whereby to cause the damper plate to close under the action of draft and open when the draft is reduced, and a sto on the bracket preventing the damper p ate from lowering to a vertical position but supporting the damper plate when lowered at a slight angle to the axis of the pipe secti0n,'said damper plate being curved on a line transversely of its pivotal axis the convex face confronting the bracket.

7. An automatic damper for stove pipes comprisin a bracket, the outer end of the bracket being bent upon itself to en age the margin of a stove pipesection and t e inner end of the bracket being bent to form an open eye, a damper plate having parallel slits, the portion between said slits being bent upwardto receive the eye, and a pintle passed beneath said upwardly bent portion and through said eye to pivot the damper on the bracket, the eye opening downwardly to permit the discharge of soot from within the eye.

In testimony thereof I hereunto aflix my signature.

THOMAS H. BUDDY. 

